Today I learned about Variables in PHP

The main way to store information in the middle of a PHP program is by using a variable.

• Here are the most important things to know about variables in PHP.


• All variables in PHP are denoted with a leading dollar sign ($).


• The value of a variable is the value of its most recent assignment.


• Variables are assigned with the = operator, with the variable on the left-hand side and


• the expression to be evaluated on the right.


• Variables can, but do not need, to be declared before assignment.


• Variables in PHP do not have intrinsic types - a variable does not know in advance


• whether it will be used to store a number or a string of characters.


• Variables used before they are assigned have default values.



• PHP does a good job of automatically converting types from one to another when
  
  necessary.
  
  PHP variables are Perl-lik
  
  PHP has a total of eight data types which we use to construct our variables:




• Integers: are whole numbers, without a decimal point, like 4195.




• Doubles: are floating-point numbers, like 3.14159 or 49.1.




• Booleans: have only two possible values either true or false.




• NULL: is a special type that only has one value: NULL.




• Strings: are sequences of characters, like 'PHP supports string operations.'




• Arrays: are named and indexed collections of other values.




• Objects: are instances of programmer-defined classes, which can package up both other kinds of values and functions that are specific to the class.




• Resources: are special variables that hold references to resources external to PHP
  
  (such as database connections).
  
  The first five are simple types, and the next two (arrays and objects) are compound - the
  
  compound types can package up other arbitrary values of arbitrary type, whereas simple
  
  types cannot.

Here's My PHP code

<?php

$x = 4;

function assignx () {$x = 0;

print "\$x inside function is $x.

";

}

assignx();

print "\$x outside of function is $x.

";

?>

This will produce the following result.

<?php

$x inside function is 0.

$x outside of a function is 4.

?>